Also made up a plenum/duct for the heater. This universal heater is becoming very specific...
The problem is that I can't mount the fan/motor assemble with the heater core under the dash. There's just no good place to package it together. So I split them up. You may have seen the fan mounted on the PS of the eng. comp in earlier pics.
In doing so I created another challenge; directing the air into the heater core. There is a space between the two that must be gapped with a plenum.
Here's the solution:
Moved the fan opening over about 1.25"
Flange on inside of firewall:
Location from other side:
Captive nuts:
View of gap between firewall and heater core:
Bridging the gap. I used posts to solidify the location/relationship between the core box and the flange:
Then filled in the blanks with sheet metal and painted:
